The majority of output is given in terms of a 6 classification output devised
by Woody and co-workers. For a full description of the classifications see:

Sreerema, N., Venyaminov, S.Y., and Woody, R.W. (1999) Estimation of the number
of helical and strand segments in proteins using CD spectroscopy.
Protein Sci. 8, 370-380.

αR

Alpha helix, regular (helix 1)

αD

Alpha helix, distorted (helix 2)

βR

Beta sheet, regular (sheet 1)

βD

Beta sheet, distorted (sheet 2)

T

Turns

U

Unordered

Reference Sets 2 and 5 have different secondary structure definitions and may
be used to analyse for 310 helix (SET 2 only) and polyproline II helix.
Sets 2 and 5 require data to cover the range 178-260nm.